Solenoid valve direct acting type and pilot type difference

Solenoid valve in industrial automation use degree is high, simple operation, strong market demand, is the solution of fluid automation control, according to the solenoid valve working form, can be divided into commonly used direct acting solenoid valve and pilot solenoid valve two kinds, such as improper selection, will cause can not normally open and close the situation, how to distinguish between the two different, And solenoid valve working principle characteristics detailed description.
1, direct acting solenoid valve product introduction:
Direct acting solenoid valve is generally used for small diameter, low pressure control, this structure of the solenoid valve open, without the media pressure difference (that is, no starting pressure), zero pressure can be started, so compared to the pilot solenoid valve starting speed, will come faster, especially suitable for the requirements of fast cut off the pipeline.
Features: relatively large power consumption, generally in 15-30w, but the control is simple, wide range of use, in vacuum, negative pressure, zero pressure, low pressure can work normally, but the diameter is generally not more than DN50mm.
Working principle of direct acting solenoid valve:
When energized, the electromagnetic force generated by the electromagnetic coil is lifted directly from the valve seat, and the electromagnetic valve is opened; Power off, the electromagnetic force disappears, the spring to close the parts on the valve seat, the electromagnetic valve closed.
2, pilot solenoid valve product introduction:
Pilot solenoid valve is generally used for differential pressure, high pressure, large diameter and other occasions, this structure of the solenoid valve open, the solenoid valve needs to have a certain starting pressure, such as in the absence of pressure, can only open the pilot hole, can not open the main valve port.
Features: Low power consumption, 10-25w, frequent power-on, long time power-on, and energy saving, the upper limit of fluid pressure range is high, arbitrary installation can be customized, but must meet the conditions of fluid pressure difference.
Note: The fluid with impurities is easy to wear the sealing surface, the seal is not strict, not suitable for the fluid with impurities and particulate matter.
Operating principle of pilot solenoid valve
When powered on, the electromagnetic force will open the pilot hole, so that the solenoid valve in the chamber pressure quickly drops, close the solenoid valve closed parts around the formation of a low high pressure difference, fluid pressure to promote the closing parts move up, the solenoid valve open; Power off, the spring force to close the pilot hole, the entrance pressure through the bypass hole quickly chamber around the valve close parts to form a low high pressure difference, fluid pressure to push the closing parts move down, close the valve.
From the difference between direct acting solenoid valve and pilot solenoid valve, pilot type than direct acting type can withstand greater pressure, and direct acting solenoid valve compared to pilot solenoid valve start speed, and do not need to start pressure, if you choose for quick cut off, or low pressure, direct acting solenoid valve is recommended, if the pressure difference is large, and high pressure, large diameter recommended to use pilot solenoid valve.
Two types of solenoid valve each has its own advantages, if the above description is not clear, you can call our company to inform the correct choice of pilot solenoid valve or direct acting solenoid valve.